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INVESTMENT SECURITIES - Schedule of trading and available-for-sale securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | $ 2,275,286 | $ 3,688,620
Total available-for-sale securities, at fair value | 473,587 | 216,621
Total | 65,860 | 0
Total investment securities | 2,814,733 | 3,905,241
Non-US sovereign debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | 1,282,450 | 2,409,126
Total available-for-sale securities, at fair value | 208,231 | 27,016
Non-US sovereign debt | 65,914 | 0
Allowance for Non-US sovereign debt | (54) | 0
Total | 65,860 |
Corporate debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | 807,985 | 1,108,870
Total available-for-sale securities, at fair value | 243,730 | 173,568
Corporate equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | 106,227 | 126,103
US sovereign debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | 73,787 | 43,173
Total available-for-sale securities, at fair value | 21,626 | 16,037
Exchange traded notes |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total trading securities | $ 4,837 | $ 1,348

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